CN105415924A - Telescopic writing tool - Google Patents

Abstract

The present invention provides a telescopic writing tool having a center core unit with good operability. A center core unit (20) in a beam barrel (10) comprises: a supporting barrel part (21a) which enables a writing part (22a) to protrude forwards and supports the writing part (22a); and a circular incline step part (21b) which is inclined towards a backward inclined radial outside direction at the rear side of the supporting barrel part (21a). A cover opening/closing component (50) is provided with, at intervals along the circumferential direction, a plurality of clamping sheet parts (54) extending backwards along the outer circumferential surface of the supporting barrel part (21a), each clamping sheet part (54) is clamped to the supporting barrel part (21a), and is extended backwards through force of force application component (60). When the center core unit (20) moves forwards, the center core unit (20) bends towards the radial outside direction of the beam barrel while being in sliding contact with the incline step part (21b), thereby relieving a clamping state with the supporting barrel part (21a).

Description

Retractable writing implement

Technical field

The present invention relates to a kind of retractable writing implement making the writing portion of sealing state outstanding by opening cover.

Background technology

Usually, in marking pen or signature pen etc., in order to be prevented the drying of writing portion by simple structure, in most cases adopt cap structure.But hat type writing implement has following room for improvement: two hands will be used when loading and unloading the cap for brush; Likely the cap for brush causes coming off because of fall impacting etc.; And ink likely the Yin Lakai cap for brush time impact and splashing etc.

So, such as, in the invention recorded in patent document 1, possess: beam barrel (shaft of a writing brush 12 and nib 20 etc.); Middle core unit (reservoir retainer 22 and keeping arm 28 etc.), is arranged in this beam barrel in the mode that can retreat, and has writing portion (writing pen point 24) in front; Sealing drum (barrel of valve 40), in beam barrel around coated described writing portion, and in the mode that cannot advance engaging in beam barrel; Cover (lid 42), closes the front end opening of sealing cylinder in the mode that can open; Lid opening and closing member (bezel ring, 62, retaining ring 64 and lid arm 66 etc.), side pressure is connected to described cover in the past; Force application part (biasing element 36), described middle core unit is rearward exerted a force, and, described cover is opened after unclamping described lid opening and closing member by making described middle core unit advance, and described writing portion is given prominence to, by making described middle core unit retreat and the described lid opening and closing member that rearward stretches, closing described cover, described writing portion is retracted.

But, according to described prior art, when described middle core unit advances, first, make the less protuberance 34 of the outer peripheral face of keeping arm 28 be connected to retaining ring 64 and promote this retaining ring 64.Further, by this promotion, at bezel ring, 62 after being connected to beam barrel front end inner face, described protuberance 34 is entered in retaining ring 64, and then make described middle core unit advance (Fig. 3 ~ 5 of referenced patent document 1).

Thus, need the size managing protuberance 34 accurately, such as, if the overhang of protuberance 34 is too small, then this protuberance 34 is not connected to retaining ring 64 and just enters in retaining ring 64, and, if the overhang of protuberance 34 is excessive, then this protuberance 34 not easily enters into retaining ring 64, and operability under any circumstance all can be caused to reduce.

Patent document 1: Japan Patent public affairs table 2012-516252 publication

Summary of the invention

The present invention completes in view of above-mentioned situation in the past, and its problem is the retractable writing implement providing the operability of middle core unit good.

Be that a kind of retractable writing implement, possesses: beam barrel for solving a kind of embodiment of above-mentioned problem, middle core unit, is arranged in this beam barrel in the mode that can retreat, and makes writing portion give prominence in front, sealing drum, in beam barrel around coated and described writing portion, and in the mode that cannot advance engaging in beam barrel, cover, closes the front end opening of sealing cylinder in the mode that can open, lid opening and closing member, side pressure is connected to described cover in the past, and force application part, described middle core unit is rearward exerted a force, and, described cover is opened after unclamping described lid opening and closing member by making described middle core unit advance, and described writing portion is given prominence to, retreat by making described middle core unit, rearward stretch described lid opening and closing member, close described cover, described writing portion is retracted, the feature of described retractable writing implement is, described middle core unit is at the rear side in the carrying cylinder portion of the described writing portion of supporting, there is the tilt stage portion of the ring-type that direction tilts outside the Fang Jing that retreads, described lid opening and closing member has multiple engagement piece portion rearward extended along the outer peripheral face in described carrying cylinder portion in the circumferential at spaced intervals, described each engagement piece portion is engaging in described carrying cylinder portion, and be rearward stretched by the force of described force application part, when described middle core unit advances, bend to direction outside beam barrel footpath while slidingly contacting with described tilt stage portion, thus remove the locking state with described carrying cylinder portion.

Invention effect

The present invention is formed as described above, and therefore, the operability of core unit is good.

Accompanying drawing explanation

Fig. 1 is the stereogram of the example representing retractable writing implement involved in the present invention, and Fig. 1 (a) represents the state that writing portion is retracted, and Fig. 1 (b) represents the state making writing portion outstanding.

Fig. 2 is the sectional view of the example representing beam barrel, and Fig. 2 (b), relative to Fig. 2 (a), makes section have rotated 90 degree.

Fig. 3 is the stereogram of the example representing middle core unit, lid and lid opening and closing member etc.

Fig. 4 is the stereogram of the example representing lid and sealing drum.

Fig. 5 is the stereogram of the example representing lid opening and closing member.

Fig. 6 is major part sectional view action when writing portion is given prominence to being shown in successively Fig. 6 (a) ~ Fig. 6 (c).

Fig. 7 is major part sectional view action when writing portion is given prominence to being shown in successively Fig. 7 (a) ~ Fig. 7 (c), relative to Fig. 6, makes section have rotated 90 degree.

In figure: 1-retractable writing implement, 10-beam barrel, 12-keeps away a hole, core unit in 20-, 21-cartridge, 21a-carrying cylinder portion, 21b-tilt stage portion, 21c-major diameter cylinder portion, 21d-engaging protrusion, 21d1-inclined plane, 22a-writing portion, 30-sealing drum, 40-cover, 42b-projection, 50-lid opening and closing member, 51-ring-type pressing portion, 52-drawing sheet portion, 53-cylinder portion, 54-engagement piece portion, 54a-is engaged hole.

Detailed description of the invention

The fisrt feature of present embodiment is that a kind of retractable writing implement, possesses: beam barrel, middle core unit, is arranged in this beam barrel in the mode that can retreat, and makes writing portion give prominence in front, sealing drum, in beam barrel around coated described writing portion, and in the mode that cannot advance engaging in beam barrel, cover, closes the front end opening of sealing cylinder in the mode that can open, lid opening and closing member, side pressure is connected to described cover in the past, and force application part, described middle core unit is rearward exerted a force, described cover is opened after unclamping described lid opening and closing member by making described middle core unit advance, described writing portion is given prominence to, retreat and the described lid opening and closing member that rearward stretches by making described middle core unit, and close described cover, described writing portion is retracted, in retractable writing implement, described middle core unit is at the rear side in the carrying cylinder portion of the described writing portion of supporting, there is the tilt stage portion of the ring-type that direction tilts outside the Fang Jing that retreads, described lid opening and closing member has multiple engagement piece portion rearward extended along the outer peripheral face in described carrying cylinder portion in the circumferential at spaced intervals, described each engagement piece portion is engaging in described carrying cylinder portion, and be rearward stretched by the force of described force application part, when described middle core unit advances, bend to direction outside beam barrel footpath while slidingly contacting with described tilt stage portion, thus remove the locking state with described carrying cylinder portion.

According to this structure, open cover after unclamping lid opening and closing member by making middle core unit advance, and when writing portion is given prominence to, multiple engagement piece portion slidingly contacts with tilt stage portion respectively, and to direction flexure outside beam barrel footpath, the locking state in each engagement piece portion and carrying cylinder portion is removed.Alleviate the frictional resistance of lid opening and closing member and middle core unit thus, thus the operability of core unit in can improving.

As second feature, on the basis of described fisrt feature, be provided with along beam barrel axially in microscler engaged hole in multiple described each engagement piece portion, the outer peripheral face in described carrying cylinder portion is provided with engaging protrusion, this engaging protrusion is inserted into the rear end side in described engaged hole, and rearward stretch described engagement piece portion.

According to this structure, the engaging protrusion of middle core unit is engaging in the rear end in the engaged hole of engagement piece portion, and rearward stretching lid opening and closing member.When central core unit advances, because each engaging protrusion forwards moves in engaged hole, therefore the rear end in engaged hole and the locking state of each locking projection are removed.

As third feature, on the basis of described second feature, the face abutted with the rear end in described engaged hole is set to toward the front to the inclined plane that direction in beam barrel footpath tilts by described engaging protrusion.

According to this structure, in during by retreating during core unit stretching lid opening and closing member, the engagement piece portion of lid opening and closing member can be made by described inclined plane to direction flexure in beam barrel footpath, and the engaged hole of engagement piece portion can be made to snap into the base end side of described engaging protrusion deeper, and then, engaging protrusion is removed with the engaging in engaged hole, thus can prevent fault.

As fourth feature, on the basis of feature any one of described the first to three, described cover is arranged to, a part for its outer peripheral edge is connected to described sealing drum, and using this coupling part as fulcrum, free end side is rotated in front-rear direction and carries out on-off action, described lid opening and closing member has side pressure in the past and is connected to the ring-type pressing portion of described cover, and there are two the drawing sheet portions being connected to described engagement piece portion from the radial end side of this ring-type pressing portion and another side respectively to rear extends, one in two the described drawing sheet portions described free end configuration near described cover, another configures near described coupling part.

According to this structure, at the free end near cover, because the ring-type pressing portion pushing this cover is supported by described drawing sheet portion, therefore, it is possible to prevent the pushing force of ring-type pressing portion from reducing because distortion waits, and the air-tightness between the described free end side of cover and the front end opening of described sealing drum reduces.

As fifth feature, on the basis of described any one feature in first to fourth, at the inner face of described cover, spaced apartly in the circumferential be provided with multiple projection, this projection is inserted in described sealing drum, and with the inner peripheral surface of described sealing drum near or contact (with reference to figure 4).

According to this structure, location when cover is closed can be carried out by multiple described projection, and then, can improve based on cover air-tightness.

As sixth feature, on the basis of any one feature in described the first to five, what arrange through-shaft tube wall surface in the front of described beam barrel keeps away a hole, described in keep away a hole and be arranged to for the front partial insertion (with reference to figure 1) of described lid opening and closing member when advancing.

According to this structure, working space when can advance making lid opening and closing member is guaranteed to keep away in a hole described.

In addition, in aftermentioned embodiment, also disclose and do not comprise above-mentioned a part of feature, and need the invention of following constitutive requirements.

That is, this invention is a kind of retractable writing implement, possesses: beam barrel; Middle core unit, is arranged in this beam barrel in the mode that can retreat, and makes writing portion give prominence in front; Sealing drum, in beam barrel around coated described writing portion, and in the mode that cannot advance engaging in beam barrel; Cover, closes the front end opening of sealing cylinder in the mode that can open; Lid opening and closing member, side pressure is connected to described cover in the past; And force application part, described middle core unit is rearward exerted a force, described cover is opened after unclamping described lid opening and closing member by making described middle core unit advance, and described writing portion is given prominence to, retreat by making described middle core unit, rearward stretch described lid opening and closing member, close described cover, and described writing portion is retracted, in retractable writing implement, what be provided with through-shaft tube wall surface in the front of described beam barrel keeps away a hole, described in keep away a hole and be arranged to for the front partial insertion of described lid opening and closing member when advancing.

According to this structure, when making lid opening and closing member advance, described in the front of this lid opening and closing member is inserted in, keep away a hole.Thus, can prevent in order to ensure the working space of lid opening and closing member that this retractable writing implement becomes maximization.

Embodiment

Then, with reference to the accompanying drawings, the preferred embodiment with above-mentioned feature is described in detail.

In the following description, " front " refers to the front extreme direction (direction that writing portion is outstanding) of beam barrel 10, and " rear " refers to the direction contrary with described " front ".Further, " in footpath direction " is the direction of the radial direction along beam barrel 10, and refers to towards the direction at the axle center of beam barrel 10 (center).And " outside footpath direction " refer to described footpath in side in the opposite direction.Further, " beam barrel is axial " refers to the direction in the axle center (center) along beam barrel 10.

This retractable writing implement 1 possesses: beam barrel 10; Middle core unit 20, is arranged in this beam barrel 10 in the mode that can retreat, and has writing portion 22a in front; Sealing drum 30, in beam barrel 10 around coated described writing portion 22a, and in the mode that cannot advance engaging in beam barrel 10; Cover 40, closes the front end opening of sealing cylinder 30 in the mode that can open; Lid opening and closing member 50, side pressure is connected to described cover 40 in the past; And force application part 60, relative to beam barrel 10 rearward centering core unit 20 exert a force, by opening described cover 40 before making described middle core unit 20 and then after unclamping described lid opening and closing member 50, and described writing portion 22a is given prominence to, by making described middle core unit 20 retreat, rearward stretch described lid opening and closing member 50, closes described cover 40, and described writing portion 22a is retracted

Beam barrel 10 is microscler cylinder-like part (with reference to figure 1), can be formed by single cartridge, also can form by connecting multiple cartridge.

This beam barrel 10 makes the tapered constriction in front, and the front of within it wall, there is the abutting portion 11 abutted for the lid opening and closing member 50 when making advance.In addition, there is in portion foremost the opening portion 19 for making writing portion 22a flexible.Abutting portion 11 is whole circumferentially in step-like face (with reference to figure 2) at beam barrel.

In the conical section of beam barrel 10 front, be provided with in the mode running through its wall and keep away a hole 12.When lid opening and closing member 50 advances, the portion foremost of this lid opening and closing member 50 is inserted into this and keeps away (with reference to figure 1 (b)) in a hole 12.

Further, be provided with at the inner peripheral surface of the front of beam barrel 10: guiding protuberance 13, pilot cap opening and closing member 50 is retreated; Engaging portion 13a, with the locking cover 40 of the mode that cannot advance and sealing drum 30; And longitudinal rib 14, be sticked in lid opening and closing member 50 and rotatable parts 24 etc. (with reference to figure 2).

Guiding protuberance 13 is give prominence to and the rib extended to beam barrel rear from the inner face of beam barrel 10, beam barrel circumference is provided with at spaced intervals a pair (with reference to figure 2 (a)).What these a pair guiding protuberance 13,13 circumferentially separated 180 degree of angles at the inner peripheral surface of beam barrel 10 is arranged at intervals with two places (with reference to figure 2 (b)).Lid opening and closing member 50 is retreated along the lateral surface of guiding protuberance 13,13.

When engaging portion 13a is formed as overlooking by the stage portion between described two guiding protuberances 13,13 roughly concavely (with reference to figure 2 (a)).This engaging portion 13a accepts the abutting projection 33 (with reference to figure 4) of sealing drum 30 and sealing drum 30 is held in and cannot be advanced.

Longitudinal rib 14, in the first half side of beam barrel 10 inner peripheral surface, is provided with two in the mode being positioned at radial both sides.Each longitudinal rib 14 is continuous in strip in front-rear direction.In footpath in each longitudinal rib 14 end face in direction and lid opening and closing member 50 outer peripheral face close to or slidingly contact, thus the moving back and forth of lid opening and closing member 50 is stablized.

Further, when rotatable parts 24 advance from the position engaging in front side engaging portion 17, the rearward end of each longitudinal rib 14 is sticked in the cam ramp 24a of rotatable parts 24, thus rotatable parts 24 are rotated.

Further, be provided with microscler poroid pilot hole 16 that core unit 20 in guiding retreats in the latter half of side of beam barrel 10 inner peripheral surface and in making core unit 20 in the front side of moving back and forth with rear side is locking and the front side engaging portion 17 of deviating from and rear side engaging portion 18 etc.

Further, middle core unit 20 possesses: cartridge 21; Pen core 22 and cotton core 23, be present in this cartridge 21 inside (with reference to figure 6); Rotatable parts 24, are installed on the periphery (with reference to figure 3) of cartridge 21 in the form of a ring; And press section 25, the open rearward end portion of blocking cartridge 21.

Further, front of core unit 20 in this, is provided with (with reference to figure 3) such as force application part 60, sealing drum 30, cover 40 and lid opening and closing members 50.

Cartridge 21 has: the carrying cylinder portion 21a (with reference to figure 6) of minor diameter tubular; Ring-type tilt stage portion 21b, is tilting to direction outside the Fang Jing that retreads closer to rear side than this carrying cylinder portion 21a; And major diameter cylinder portion 21c, rearward extended from this tilt stage portion 21b.

As shown in Figure 6, carrying cylinder portion 21a is fitted together to pen core 22 in the mode that cannot retreat therein, and the writing portion 22a of this pen core 22 front end is forwards given prominence to.Force application part 60 (according to illustrated example, being compression helical spring) is installed in the form of a ring in this carrying cylinder portion 21a, in addition, closer to front side, sealing drum 30 is installed than this force application part 60 in the form of a ring.

Ratio force application part 60 in carrying cylinder portion 21a, closer to the outer peripheral face of rear side, is provided with two engaging protrusion 21d, 21d in the mode that the both sides to radial direction are outstanding.These engaging protrusion 21d, 21d are sticked in lid opening and closing member 50 described later.

The face that the rear end of the engaged hole 54a with engagement piece portion 54 abuts is set to toward the front to the inclined plane 21d1 that direction in beam barrel footpath tilts by each engaging protrusion 21d.

Pen core 22 is formed by a large amount of synthetic resin fiber is converged shaft-like, and its front end has the writing portion 22a (with reference to figure 6 and Fig. 7) of such as shell shape or angular cutouts shape etc., the suitable shape corresponding with the purposes of this retractable writing implement.

Cotton core 23 is formed by making in cylindric bound a large amount of fiber impregnation ink, and its leading section is inserted with the rearward end (with reference to figure 6 and Fig. 7) of pen core 22.

Further, tilt stage portion 21b is the inclined plane in the outer direction of Fang Jing of retreading towards beam barrel, and is formed as continuous print ring-type (with reference to figure 3) on the complete cycle of beam barrel circumference.

When central core unit 20 advances in beam barrel 10, this tilt stage portion 21b is connected to the rear end of the engagement piece portion of lid opening and closing member 50, and its angle of inclination is set appropriately, to make outer direction flexure (with reference to figure 6) of the rear end side radius vector of this engagement piece portion.

Major diameter cylinder portion 21c is rearward extended from the maximum gauge part of tilt stage portion 21b.The periphery of this major diameter cylinder portion 21c is chimeric in the form of a ring rotatable parts 24.Further, be connected with press section 25 in the rear end of major diameter cylinder portion 21c, accommodate cotton core 23 in the inside of major diameter cylinder portion 21c.

Rotatable parts 24 be cam ramp 24a by being wholely set the longitudinal rib 14 being sticked in beam barrel 10 inner peripheral surface at annular body portion 24b and to direction in beam barrel footpath can elastic deformation locking raised 24c etc. and form.Cam ramp 24a is formed at the projection of forwards giving prominence to from the front-end edge of annular body portion 24b.Further, locking projection 24c is arranged at the projection piece rearward given prominence to from the back edge of annular body portion 24b, and outstanding to direction outside beam barrel footpath.

Further, sealing drum 30 is around the leading section of coated carrying cylinder portion 21a and writing portion 22a, and is installed on the roughly cylindric parts of the front of carrying cylinder portion 21a in the mode that can retreat.

The rear end side inner peripheral surface of sealing cylinder 30, is provided with and slidingly contacts with the outer peripheral face of carrying cylinder portion 21a and keep bubble-tight circular protrusion 31 (with reference to figure 6 and Fig. 7).

Further, the stage portion 32 of the front end accepting force application part 60 is provided with at the rear end side outer peripheral face of sealing drum 30.

Radial both sides in the front outer peripheral face of sealing drum 30 are provided with and abut projection 33 (with reference to figure 4).This abutting projection 33 is connected to the engaging portion 13a (with reference to figure 2) in beam barrel 10, thus restriction sealing drum 30 forwards moves.

The front inner peripheral portion of sealing drum 30 is provided with the seal 34 of tubular.The seal 34 is formed by elastomer resin is shaped in sealing drum 30.When the front end opening by cover 40 close encapsulation cylinder 30, the seal 34 is crimped on cover 40 inner face, thus improves the sealing in sealing drum 30.

Further, the front in sealing drum 30 peripheral part, is provided with cover 40 in mode to be opened/closed.

Cover 40 is one-body molded by synthetic resin material (such as polypropylene etc.), and makes connecting portion 43 elastic deflection that is connected with the front outer peripheral face of sealing drum 30, thus discoid lid body 42 is rotated.

Lid body 42 is formed as can embedding to the inner edge of the front end opening of sealing drum 30 deviate from discoid, and within it face is provided with and is positioned at by paracentral protrusion 42a and the projection 42b of surrounding being positioned at this protrusion 42a.

Protrusion 42a is formed as convex surface shape outstanding in sealing drum 30 under the closed state of cover 40.This protrusion 42a accepts the writing portion 22a advanced, and becomes easy to make opening of lid body 42.

Projection 42b is with the both sides of not disturbing the mode of writing portion 22a to be positioned at the flexible path of writing portion 22a, and be provided with multiple in the circumferential at spaced intervals, under the closed state of cover 40, near to or in contact with in inner edge, sealing drum 30 front by cover 40 centering.According to this projection 42b, vibration when can prevent the cover 40 of closed state by transporting or using etc. to radial deflection, and can prevent sealing impaired.

Further, connecting portion 43 connects roughly in the part for outer peripheral edge for cover 40 of closed state with a part for the front outer peripheral face of sealing drum 30, and by elastic deflection, cover 40 is rotated, thus carries out opening or closing.

Sealing drum 30 and the cover 40 of said structure can assemble separate part respectively, also can be set to integrated parts in advance.

Further, lid opening and closing member 50 possesses: ring-type pressing portion 51, crimps from front side relative to cover 40; Two drawing sheet portions 52,52, extend from radial end side and another side of ring-type pressing portion 51 respectively to rear; Cylinder portion 53, is connected to the rear end side in these drawing sheet portions 52,52; And two engagement piece portion 54,54, rearward extend from this portion 53, described lid opening and closing member 50 is by can the synthetic resin material (such as polyformaldehyde or polypropylene etc.) of elastic deflection and one-body molded.

Ring-type pressing portion 51 is formed as the ring-type being embedded in cover 40 from front side, and is rearward stretched by two drawing sheet portions 52,52, thus the peripheral side before thrust cap parts 40.

This ring-type pressing portion 51 is by forwards leaving from the cover 40 of closed state and can rotating (opening action) to the front of cover 40.Further, this ring-type pressing portion 51 can be rotated to the rear of this cover 40 (closing action) (with reference to figure 6 and Fig. 7) by the edge of the cover 40 from front pushing open mode.

Drawing sheet portion 52,52 is the parts (with reference to figure 5) rearward extended from all sides of ring-type pressing portion 51.A side in these drawing sheet portions 52,52 configures near the free end (be upside according to Fig. 7) of the cover 40 rotated, and the opposing party configures near the connecting portion 43 (be downside according to Fig. 7) of cover 40.

According to this configuration, owing to being correspondingly provided with drawing sheet portion 52 with the free end of the cover 40 near closed state, even if therefore produce cover 40 be out of shape etc. when, its distortion can be corrected by the tensile force produced according to drawing sheet portion 52, and then, can prevent from producing gap between the free end side and sealing drum 30 of cover 40.

Cylinder portion 53 is fitted together in the form of a ring with the state with play around force application part 60, at its perisporium, has the guiding recess 53a (with reference to figure 5) of front openings in the side of radial direction and opposite side respectively.Each guiding recess 53a is embedded in a pair guiding protuberance 13,13 (with reference to figure 2) of beam barrel 10 inner face, the movement of the fore-and-aft direction of pilot cap opening and closing member 50.

Configure carrying cylinder portion 21a and force application part 60 between engagement piece portion 54,54, and be arranged to two strand.Each engagement piece portion 54 is rearward extended along the side of force application part 60, when central core unit 20 advances, slidingly contacts and bend (with reference to figure 6) to direction outside beam barrel footpath with the tilt stage portion 21b of middle core unit 20.

Being provided with along beam barrel in each engagement piece portion 54 is axially microscler engaged hole 54a.The back edge of this engaged hole 54a is engaging in the engaging protrusion 21d of 21a periphery, carrying cylinder portion.

Force application part 60 is compression helical spring, its front end is connected to the stage portion of sealing drum 30, and the part on front side of the engaging protrusion 21d making rear end be connected in carrying cylinder portion 21a, between sealing drum 30 and middle core unit 20, there is elasticity.

Thus in each engagement piece portion 54 engaging under the state of engaging protrusion 21d, lid opening and closing member 50 is forwards biased relative to middle core unit 20 by the force of force application part 60.

As shown in Figure 3, above-mentioned middle core unit 20, sealing drum 30, cover 40, lid opening and closing member 50 and force application part 60 are integrated, and are inserted in beam barrel 10 from rear side.Now, by the not shown projection of the rear end side periphery being arranged at cartridge 21 being inserted into the notch 16a of beam barrel 10 rear end, carry out the contraposition of circumference.Further, make described projection enter into beam barrel 10 inner peripheral surface side and advance afterwards, and be embedded in pilot hole 16.

Then, about the retractable writing implement 1 of said structure, its characteristic action effect is explained.

Fig. 1 and Fig. 6 (a) represents the original state that writing portion 22a is retracted.In this original state, locking projection 24c is sticked in rear side engaging portion 18 by the rotatable parts 24 of middle core unit 20 periphery.

Further, under this original state, because lid opening and closing member 50 is forwards biased by force application part 60, therefore the inner edge, rear end of the engaged hole 54a of each engagement piece portion 54 is engaged the inclined plane 21d1 pushing of projection 21d rear end.Thus each engagement piece portion 54 maintains by the state of described inclined plane 21d1 to direction flexure in beam barrel footpath.

Under described original state, if be pushed to front etc. because of press section 25, if middle core unit 20 advances, then locking projection 24c deviates to direction flexure in beam barrel footpath from rear side engaging portion 18, and advances along the inner peripheral surface of beam barrel 10.Further, the locking projection 24c of advance is embedded in front side engaging portion 17 and engaged.

In described advance process, in the toe lateral of middle core unit 20, two engagement piece portion 54,54 of lid opening and closing member 50 are rearward left from engaging protrusion 21d while the flexure of direction gradually respectively to outside beam barrel footpath.

Be described in detail, if middle core unit 20 advances, the rear end of each engagement piece portion 54 then in lid opening and closing member 50 and the tilt stage portion 21b of cartridge 21 slidingly contact, the outer direction flexure of each engagement piece portion 54 radius vector, and the back edge of the engaged hole 54a of each engagement piece portion 54 rearward leaves from inclined plane 21d1, major diameter cylinder portion 21c advances (with reference to figure 6 (b)) in the mode entered between two engagement piece portion 54,54.

Further, in middle core unit 20 advance process, sealing drum 30 cannot advance engaging in the engaging portion 13a in beam barrel 10, and therefore cover 40 is pushed by the front end of the pen core 22 advanced and opens gradually (with reference to figure 6 (b)).

And, by described advance, if the front end of lid opening and closing member 50 is connected to the abutting portion 11 of beam barrel 10 Inner Front End, then lid opening and closing member 50 cannot advance, but middle core unit 20 is advanced further in the mode entered between two engagement piece portion 54, as shown in Fig. 6 and 7 (c), writing portion 22a is forwards given prominence to from opening portion 19.This projected state is maintained by the locking of the locking projection 24c of middle core unit 20 side and the front side engaging portion 17 of beam barrel 10 side.

Further, under described projected state, when making writing portion 22a retract, the operation forwards promoted further press section 25 is carried out.By this operation, middle core unit 20 advances, locking projection 24c deviates from from front side engaging portion 17 and enters to beam barrel 10 inner peripheral surface side, by the engaging of longitudinal rib 14 (with reference to figure 2) and cam ramp 24a (with reference to figure 3), rotatable parts 24 rotate, and locking projection 24c is positioned at the position being sticked in front side engaging portion 17.

Under this state, if removed the pushing force of press section 25, then in, core unit 20 is retreated by the force of force application part 60, and locking projection 24c is embedded in rear side engaging portion 18 and turns back to original state.

In the process of moving back in the rear, perform the operation of the order shown in (c) (b) (a) of Fig. 6 ~ Fig. 7 in the toe lateral of middle core unit 20.

Namely, in the starting stage that middle core unit 20 retreats, lid opening and closing member 50 by beam barrel 10 inner peripheral portion (specifically, guiding protuberance 13 and longitudinal rib 14 etc.) friction and near extrusion position side, and retreat hardly, each engaging protrusion 21d rearward moves in engaged hole 54a, with this action, in the opening portion 19 of writing portion 22a retraction beam barrel 10, so mobile to sealing drum 30 inside.

Further, if middle core unit 20 continues to retreat, then each engaging protrusion 21d is engaging in the inner edge, rear end of engaged hole 54a, and therefore lid opening and closing member 50 is stretched to engaging protrusion 21d and starts to retreat.

So pushed by the lid opening and closing member 50 retreated, cover 40 carries out closed action, and by this cover 40, the opening portion of sealing drum 30 is closed, and turn back to original original state (retracted mode).

Thus, according to retractable writing implement 1, when making middle core unit 20 advance, the engagement piece portion 54,54 of two strand is flexibly bent along the tilt stage portion 21b of cartridge 21, owing to removing the locking of these engagement piece portion 54,54 and middle core unit 20, therefore, it is possible to reduce resistance sense when centering core unit 20 carries out bulldozing operation, and middle core unit 20 can be made to advance swimmingly.

In addition, according to above-described embodiment, be set to the structure of the engagement piece portion 54 with two lid opening and closing members 50, but, as other examples, the structure of the engagement piece portion 54 arranging more than 3 along beam barrel circumferentially spaced interval also can be set to.In this situation, the engaging protrusion 21d of core unit 20 side in also arranging more than 3, and by each engaging protrusion 21d engaging in engagement piece portion 54.

And, according to above-described embodiment, the locking strutcture on initial position and extrusion position is made up of the locking projection 24c of middle core unit 20 periphery, the rear side engaging portion 18 of beam barrel 10 side and front side engaging portion 17 etc., but as other examples, by the structure beyond described locking strutcture, also can by middle core unit 20 engaging in initial position and extrusion position.

And, constitute cotton core formula writing implement in the above-described embodiments, but as other examples, also the retractable writing implement beyond cotton core formula writing implement can be formed, namely save described cotton core 23 and form direct-fluid-supply writing implement, or pen core 22 and cotton core 23 being replaced to ball pen with for core and form ball pen etc.

Claims (6)

1. a retractable writing implement, it possesses: beam barrel; Middle core unit, is arranged in this beam barrel in the mode that can retreat, and makes writing portion give prominence in front; Sealing drum, in beam barrel around coated described writing portion, and in the mode that cannot advance engaging in beam barrel; Cover, closes the front end opening of sealing cylinder in the mode that can open; Lid opening and closing member, side pressure is connected to described cover in the past; And force application part, rearward to described middle core unit force, described cover is opened after unclamping described lid opening and closing member by making described middle core unit advance, described writing portion is given prominence to, by making described middle core unit retreat and the described lid opening and closing member that rearward stretches, closing described cover, and described writing portion is retracted, the feature of described retractable writing implement is

Described middle core unit has the tilt stage portion of the ring-type that direction tilts outside the Fang Jing that retreads at the rear side in the carrying cylinder portion of the described writing portion of supporting,

Described lid opening and closing member has multiple engagement piece portion rearward extended along the outer peripheral face in described carrying cylinder portion in the circumferential at spaced intervals,

Each engagement piece portion in described engagement piece portion is engaging in described carrying cylinder portion, and be rearward stretched by the force of described force application part, when described middle core unit advances, slidingly contact with described tilt stage portion, and direction flexure outside beam barrel footpath, thus remove the locking state with described carrying cylinder portion.

2. retractable writing implement according to claim 1, is characterized in that,

Each engagement piece portion in multiple described engagement piece portion, is axially provided with microscler engaged hole to beam barrel,

The outer peripheral face in described carrying cylinder portion is provided with engaging protrusion, and this engaging protrusion is inserted into the rear end side in described engaged hole, thus described engagement piece portion is rearward stretched.

3. retractable writing implement according to claim 2, is characterized in that,

The face abutted with the rear end in described engaged hole is set to toward the front and the inclined plane tilted to direction in beam barrel footpath by described engaging protrusion.

4. retractable writing implement according to claim 1, is characterized in that,

The part that described cover is arranged to its outer peripheral edge is connected to described sealing drum, and using this coupling part as fulcrum, free end side is rotated in front-rear direction and carries out opening and closing operations,

Described lid opening and closing member has the ring-type pressing portion that in the past side pressure is connected to described cover, and has two the drawing sheet portions extending respectively to rear from the end side of the radial direction of this ring-type pressing portion and another side and be connected to described engagement piece portion,

One in two the described drawing sheet portions configuration of the described free end near described cover, its another configure near described coupling part.

5. retractable writing implement according to claim 1, is characterized in that,

At the inner face of described cover, be circumferentially provided with multiple projection at spaced intervals, this projection is inserted in described sealing drum, and with the inner peripheral surface of described sealing drum near to or in contact with.

6. retractable writing implement according to any one of claim 1 to 5, is characterized in that,

In the front of described beam barrel, what be provided with through-shaft tube wall surface keeps away a hole,

A described hole of keeping away is arranged to for the front partial insertion of described lid opening and closing member when advancing.